They are in the same HD and it is working fine. 271GB is in used and 324GB is free space. Trash can is empty.

Actually, I'm copying facepack of Football Manager 2012. I had played this game for many years with different OSX version. Since I updated to Lion, adding pics of facepack become painful to me. I have no problem copying those files to a new folder but when I add more files into a existed folder which contains lots of files already, the whole process become very slow. It only done 54.7MB since I started copying files 30mins ago......